<template>
  <section class="loginContainer">
    <div class="loginInner">
      <div class="login_header">
        <h2 class="login_logo">硅谷外卖</h2>
        <div class="login_header_title">
          <a href="javascript:;" :class="{on: loginWay}" @click="handleLoginWay">短信登录</a>
          <a href="javascript:;" :class="{on: !loginWay}" @click="handleLoginWay">密码登录</a>
        </div>
      </div>
      <div class="login_content">
        <form @submit.prevent="login">
          <div :class="{on: loginWay}">
            <section class="login_message">
              <input type="tel" maxlength="11" placeholder="手机号" v-model="phone">
              <button :disabled="!rightPhone" class="get_verification" :class="{right_phone: rightPhone}" @click="getCode()">
                {{ computeTime>0 ? `已发送(${computeTime}s)` : '获取验证码'}}
              </button>
            </section>
            <section class="login_verification">
              <input type="tel" maxlength="8" placeholder="验证码" v-model="code">
            </section>
            <section class="login_hint">
              温馨提示：未注册硅谷外卖帐号的手机号，登录时将自动注册，且代表已同意
              <a href="javascript:;">《用户服务协议》</a>
            </section>
          </div>
          <div :class="{on: !loginWay}">
            <section>
              <section class="login_message">
                <input type="text" maxlength="11" placeholder="手机/邮箱/用户名" v-model="name">
              </section>
              <section class="login_verification">
                <input type="text" maxlength="8" placeholder="密码" v-if="showPwd" v-model="pwd">
                <input type="password" maxlength="8" placeholder="密码" v-else v-model="pwd">
                <div class="switch_button" :class="showPwd ? 'on' : 'off' " @click="showPwd=!showPwd">
                  <div class="switch_circle" :class="{right: showPwd}"></div>
                  <span class="switch_text">{{ showPwd ? 'abc' : '...' }}</span>
                </div>
              </section>
              <section class="login_message">
                <input type="text" maxlength="11" placeholder="验证码" v-model="captcha">
                <img class="get_verification" src="http://localhost:4000/captcha" alt="captcha" @click="getCaptcha" ref="captcha">
              </section>
            </section>
          </div>
          <button class="login_submit">登录</button>
        </form>
        <a href="javascript:;" class="about_us">关于我们</a>
      </div>
      <a href="javascript:" class="go_back" @click="goBack">
        <i class="iconfont iconjiantou"></i>
      </a>
    </div>

    <AlertTip :alertText="alertText" v-show="showAlert" @closeTip="closeTip"></AlertTip>
  </section>
</template>

<script>
import AlertTip from '../../components/AlertTip/AlertTip.vue'
import { reqSendCode, reqSmsLogin, reqPwdLogin } from '../../api'

export default {
  name: 'Login',
  data () {
    return {
      loginWay: true, // true 为短信登录，false 为密码登录
      phone: '', // 手机号码
      computeTime: 0, // 计时的时间
      showPwd: false, // 是否显示密码
      pwd: '', // 密码
      code: '', // 短信验证码
      name: '', // 用户名
      captcha: '', // 图形验证码
      alertText: '', // 提示文本
      showAlert: false // 是否显示警告框
    }
  },
  methods: {
    // 返回上一页
    goBack () {
      this.$router.back()
    },
    // 切换登录方式
    handleLoginWay () {
      this.loginWay = !this.loginWay
    },
    // 异步获取短信验证码
    async getCode () {
      // 如果当前没有计时
      if (!this.computeTime) {
        // 启动倒计时
        this.computeTime = 30
        this.intervalId = setInterval(() => {
          this.computeTime--
          if(this.computeTime<=0) {
            // 停止倒计时
            clearInterval(this.intervalId)
          }
        }, 1000)

        // 发送 ajax 请求，向指定的手机号发送验证码短信
        const result = await reqSendCode(this.phone)
        if (result.code === 1) { // 发送失败
          // 显示提示
          this.showAlert = true
          this.alertText = result.msg
          // 停止倒计时
          if (this.computeTime) {
            this.computeTime = 0
            clearInterval(this.intervalId)
            this.intervalId = undefined
          }
        }
      }
    },
    // 异步登录
    async login () {
      let result
      // 前台表单验证
      if (this.loginWay) { // 短信登录
        const { rightPhone, phone, code } = this
        if (!this.rightPhone) {
          // 手机号不正确
          this.showAlert = true
          this.alertText = '手机号不正确'
          return
        } else if (!/^\d{6}$/.test(code)) {
          // 验证码必须是6位数字
          this.showAlert = true
          this.alertText = ' 验证码必须是6位数字'
          return
        }
        // 发送 ajax 请求短信登录
        result = await reqSmsLogin(phone, code)
      } else { // 密码登录
        const { name, pwd, captcha } = this
        if (!this.name) {
          // 用户名必须指定
          this.showAlert = true
          this.alertText = '用户名必须指定'
          return
        } else if (!this.pwd) {
          // 密码必须指定
          this.showAlert = true
          this.alertText = '密码必须指定'
          return
        } else if (!this.captcha) {
          // 验证码必须指定
          this.showAlert = true
          this.alertText = '验证码必须指定'
          return
        }
        // 发送 ajax 请求密码登录
        result = await reqPwdLogin({name, pwd, captcha})
      }

      // 停止计时
      if (this.computeTime) {
        this.computeTime = 0
        clearInterval(this.intervalId)
        this.intervalId = undefined
      }

      // 根据结果数据处理
      if (result.code === 0) { // 登录成功
        const user = result.data
        // 将 user 保存到 vuex 的 state
        this.$store.dispatch('recordUser', user)
        // 去个人中心界面
        this.$router.replace('/profile')
      } else { // 登录失败
        // 显示新的图片验证码
        this.getCaptcha()
        // 显示警告提示
        const msg = result.msg
        this.showAlert = true
        this.alertText = msg
      }

    },
    // 弹出警告框
    closeTip () {
      this.showAlert = false
      this.alertText = ''
    },
    // 获取新的图片验证码
    getCaptcha () {
      // event.target.src = 'http://localhost:4000/captcha?time=' + Date.now()
      this.$refs.captcha.src = 'http://localhost:4000/captcha?time=' + Date.now()
    }
  },
  computed: {
    rightPhone () {
      return /^1\d{10}$/.test(this.phone)
    }
  },
  components: {
    AlertTip
  }
}
</script>

<style lang="stylus" scoped>
    @import '../../common/stylus/mixins.styl'
    .loginContainer
        width 100%
        height 100%
        background #fff
        .loginInner
            padding-top 60px
            width 80%
            margin 0 auto
            .login_header
                .login_logo
                    font-size 40px
                    font-weight bold
                    color #02a774
                    text-align center
                .login_header_title
                    padding-top 40px
                    text-align center
                    >a
                        color #333
                        font-size 14px
                        padding-bottom 4px
                        &:first-child
                            margin-right 40px
                        &.on
                            color #02a774
                            font-weight 700
                            border-bottom 2px solid #02a774
            .login_content
                >form
                    >div
                        display none
                        &.on
                            display block
                        input
                            width 100%
                            height 100%
                            padding-left 10px
                            box-sizing border-box
                            border 1px solid #ddd
                            border-radius 4px
                            outline 0
                            font 400 14px Arial
                            &:focus
                                border 1px solid #02a774
                        .login_message
                            position relative
                            margin-top 16px
                            height 48px
                            font-size 14px
                            background #fff
                            .get_verification
                                position absolute
                                top 50%
                                right 10px
                                transform translateY(-50%)
                                border 0
                                color #ccc
                                font-size 14px
                                background transparent
                                &.right_phone
                                    color black
                        .login_verification
                            position relative
                            margin-top 16px
                            height 48px
                            font-size 14px
                            background #fff
                            .switch_button
                                font-size 12px
                                border 1px solid #ddd
                                border-radius 8px
                                transition background-color .3s,border-color .3s
                                padding 0 6px
                                width 30px
                                height 16px
                                line-height 16px
                                color #fff
                                position absolute
                                top 50%
                                right 10px
                                transform translateY(-50%)
                                &.off
                                    background #fff
                                    .switch_text
                                        float right
                                        color #ddd
                                        padding-right 10px
                                &.on
                                    background #02a774
                                >.switch_circle
                                    //transform translateX(27px)
                                    position absolute
                                    top -1px
                                    left -1px
                                    width 16px
                                    height 16px
                                    border 1px solid #ddd
                                    border-radius 50%
                                    background #fff
                                    box-shadow 0 2px 4px 0 rgba(0,0,0,.1)
                                    transition transform .3s
                                    &.right
                                        transform translateX(30px)
                        .login_hint
                            margin-top 12px
                            color #999
                            font-size 14px
                            line-height 20px
                            >a
                                color #02a774
                    .login_submit
                        display block
                        width 100%
                        height 42px
                        margin-top 30px
                        border-radius 4px
                        background #4cd96f
                        color #fff
                        text-align center
                        font-size 16px
                        line-height 42px
                        border 0
                .about_us
                    display block
                    font-size 12px
                    margin-top 20px
                    text-align center
                    color #999
            .go_back
                position absolute
                top 5px
                left 5px
                width 30px
                height 30px
                >.iconfont
                    font-size 20px
                    color #999
                    padding-top 10px
</style>

